 First, let’s define service facilities (per plumbing code). This would encompass anything from routine car cleaning and detailing, to full blown engine repair. "Service" applies not only to vehicles, but also to any kind of machinery that could leak oil into the building drainage system. Both UPC and IPC recognize the following to calculate the capacity of an oil separator: (6) cubic feet for the first 100 square feet of drainage area, plus (1) cubic foot of required capacity for each additional 100 square feet. Here's an example: Oil change facility with 900 square feet of drainage area.
Keep in mind that some jurisdictions have their own requirements: 500 gallons, 1000 gallons, double-wall mandate, only allow concrete, etc. If this is the case in your territory, let's work on changing that. Below is a quick reference sizing chart that can found on page 3 of our 2017 Catalog. 
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 Did you know that each oil separator (OS) has a matching oil collection tank (OCT)? It is not a requirement for an OS to be installed with an OCT. However, there is one application where it makes a lot of sense: oil level monitoring. If the project requires an oil level monitoring system, an OS would need to be installed with an OCT and an AVA-3 or AVA-4 level monitoring system. The level system includes a control panel with audio and visual alarms, as well as the single- or multi-level float switch. The float switch is to be installed in the OCT. We provide everything needed to install the float switch inside the OCT. The OS would be ordered with a draw-off arm (D02) to draw oil from the OS to the OCT. A secondary benefit of an OCT is that it increases the total liquid and oil capacity of the oil separator system. We recommend only installing equal-sized OS and OCT units. 
Publication sent from "Did you know" memo from Striem on 01/23/17.
  As the rep for Striem in Washington, Northern Idado and Alaska we receive "quick facts" memos that allow us to learn a bit more about some of the products we sell. I found this very informing and thought I would pass it on. Learn more about Striem at striemco.com. Some call it coalescing media. We like to call it a "polypropylene beehive" since it's important to distinguish its material of construction. Why? The short answer: chemistry. Polypropylene is a plastic derived from hydrocarbons (a fancy term for oil). Hydrocarbons are what we're trying to separate from water. In chemistry, similar molecules are attracted to each other. Thus, polypropylene is an "oil-loving" material. If you're trying to impress an engineer, just say "polypropylene is oleophilic." When oily wastewater enters the separator, it is forced through the coalescing media. The oil droplets latch onto the media. As more droplets coagulate on the media, they merge with one another and eventually become buoyant enough to detach from the media and rise to the surface. Larger oil droplets rise to the surface more quickly than smaller droplets. Pretty simple! Striem recommends coalescing media in applications where oil droplets tend to emulsify into smaller droplets. This may occur in pump applications (e.g., elevator pits) and applications where surfactants are used (e.g., car washes). For further information on Striem's Clean Sweep coalescing media, please request our Technical Bulletin by sending an email to help@striemco.com.
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